Fig. 5

OSNs that choose to express a particular OR project to a specific protoglomerulus. a Cumulative protoglomerular projection data for each of the ORs examined in this study. BAC: BAC employed, ORs: specific OR modified with IRES:Gal4 just after its coding sequence, N: total number of olfactory pits with labeled sensory neurons observed. The remaining columns tabulate the number of pits with axons projecting to the indicated protoglomeruli. If a pit had sensory axons projecting to more than one protoglomerulus, the number of counts can exceed N. The predominantly targeted protoglomerulus is indicated in red. b The relationships between OR, BAC, and genomic positions for the BACs used in this study. Chromosomes are pictured at the top with the approximate locations of BACs in black. Within each box OR gene clusters are represented with black arrows showing the direction in which genes are transcribed. BACs employed are represented by hashed bars and the approximate locations of each of the ORs we co-labeled with IRES:Gal4 are indicated with flags. Projection to the CZ (dark blue) or the DZ (light blue) is indicated. Scale bar: 0.1 Mb. c OSNs that chose to express ORs from clade A comprising subfamilies or101–114, or clade B comprising subfamilies or114–128, were found to project to the CZ protoglomerulus (dark blue boxes). OMP class OSNs that chose to express members of clade C comprising subfamilies or129–137 project to the DZ protoglomerulus (light blue boxes)